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对多重热处理得来的铸造Ｔｉ－４６．５Ａｌ－２．５Ｖ－１．０Ｃｒ－０．２Ｎｉ（原子分数，％）合金细小全层片（ＦＦＬ）组织断裂韧性试样侧面和断口形貌及裂纹区位错、孪晶结构进行了观察分析．发现ＦＦＬ组织具有和ＦＬ组织相同的断裂特征，即多重断裂和裂尖区充分形变．但层片团尺寸的大幅度减小使得单个剪切带对应变能的消耗减小较多，且使裂纹扩展中总的变形体积减小，从而减弱了剪切带的韧化作用，使ＦＦＬ组织具有相对ＦＬ组织较低的断裂韧性．
The side and fracture morphology of the as-cast TiN-46.5Al-2.5V-1.0Cr-0.2Ni (atomic fraction,%) alloy micro-full scale (FFL) Dislocation, twin structure were observed and analyzed. FFL tissue was found to have the same fracture characteristics as the FL tissue, ie, multiple fractures and adequate deformation of the mitral area. However, the drastic reduction of the size of the delaminated layers reduces the corresponding strain energy consumption in a single shear band and decreases the total deformation volume in the crack propagation, thus weaken the toughening effect of the shear band and make the FFL The tissue has a lower fracture toughness relative to the FL tissue.